Class methods in D?

[Mehrdad]

On Thursday, 3 May 2012 at 17:45:20 UTC, Steven Schveighoffer 
wrote:
> This works:
>
> import std.stdio;
>
> class A
> {
>   string name;
>   this() {this.name = typeid(this).name;}
> }
>
> class B : A {}
>
> void main()
> {
>    A b = new B;
>    A a = new A;
>    writefln("A: %s, B: %s", a.name, b.name);
> }
>
> outputs:
>
> A: testclassname.A, B: testclassname.B
>
> -Steve

Oh, but that's only the name!

The trouble is that window classes have a lot of attributes -- 
styles, background brushes, etc. -- that are all shared across 
instances.

There is currently no way (that I know of) to allow a subclass to 
define its own attributes, *without* also giving it a chance to 
define them per-instance instead of per-class.